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Another early adopter of the 4-6-4 was the Atchison, Topeka, & Santa Fe (Santa Fe) who ordered 10 3450 class 4-6-4 locomotives in 1927 from Baldwin. The 3450 class employed the same boiler as Santa Fe's 3400 class Pacifics with a larger grate and slightly smaller 73 in drivers. Santa Fe designated their new 4-6-4 a "Heavy Pacific".